Re: How can I delete a primary or foreign key?

you are right. the correct version is:

ALTER TABLE name_of_table
    DROP CONSTRAINT constraint_name [ RESTRICT | CASCADE ]

On Friday 20 Feb 2004 17:53, you wrote:
> tibor wrote:
> > I forgot to mention that I have tried numerous variations.
> > The one quoted in the original mail was from "The Complete Reference"
> > series. I've also tried the one that the \h command suggests:
> >
> > ALTER TABLE PARENTS DROP CONSTRAINT FOREIGN KEY (TYPE) CASCADE;
>
>                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
>
> You are forgetting the name of the constraint.
>
> Sincerely,
>
> Joshua D. Drake
>
> > but all I got was:
> >
> > ERROR:  syntax error at or near "foreign" at character 37
> >
> > the DROP CONSTRAINT clause doesn't recognise either PRIMARY or FOREIGN
> > KEY option. (not implemented, I guess)
> >
> > On Friday 20 Feb 2004 16:42, you wrote:
> >>On Fri, 20 Feb 2004, Tibor wrote:
> >>>I am using PostgreSQL 7.4.1 (only through psql)
> >>>I know, that the command
> >>>
> >>>ALTER TABLE OFFICES
> >>>    DROP PRIMARY KEY (CITY);
> >>>
> >>>and its foreign key equivalent:
> >>>
> >>>ALTER TABLE SALESREPS
> >>>    DROP CONSTRAINT
> >>>FOREIGN KEY (REP_OFFICE)
> >>>    REFERENCES OFFICES;
> >>>
> >>>don't work in PostgreSQL because they are not implemented. However,
> >>> isn't there another way of removing them?
> >>
> >>That's not the correct syntax for ALTER TABLE ... DROP CONSTRAINT.
> >>
> >>ALTER TABLE tablename DROP CONSTRAINT constraint_name [RESTRICT |
> >> CASCADE]

--
Tibor Harcsa